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									                          ME 3222 - Design and Manufacturing II
                                             Fall 2002
                                        Course Project

                                            Tom Chase

                                        September 9, 2002

   You will design and build a prototype of a ma-        project are provided. A series of Appendices pro-
chine which performs a task of your choice in this       vide a sample written project proposal, tips for
class. You will be organized into teams of three.        preparing visuals for your oral presentations, and
The project will be split into two parts to ap-          grading sheets.
proximately correlate with the course syllabus.
   In Part I, you will develop the kinematics of
your machine using precision position methods.           1       Project Contents
You will also build a concept demonstration pro-
                                                         Every project will address the following four top-
totype. The prototype will probably use simple
implementations of the links and joints. Fur-
thermore, the power source may differ from the
final design; for example, it may be hand pow-            1.1     Linkage Synthesis
ered rather than motor powered.
                                                         You will use a synthesis technique known as the
   Part II will consist of carrying through on de-
                                                         “three precision position analytical method” to
signing the machine elements. This may involve
                                                         design your linkage. A two precision position
designing the power train, re-shaping links to ac-
                                                         synthesis program will be made available with
count for the stresses within them, and choosing
                                                         one of the homework assignments. You will con-
optimal bearings for your task. A model will not
                                                         vert this to a three position program in the fol-
be required for Part II.
                                                         lowing homework set1 .
   The purpose of this project is to provide you
                                                           You may well want to enhance your program
with an opportunity to apply the methods you
                                                         beyond the minimum stated above. For example,
learn in this class to the actual design of a new
                                                         the sample program prints only the vectors com-
machine. Your project experiences may differ
                                                         prising the linkage; you may also want to print
substantially from solving homework problems
                                                         the x-y coordinates of the ground and moving
and quizzes, as you must deal with open-ended
                                                         pivots of the linkage. Some teams may wish to
choices and incomplete data. However, we hope
                                                         implement the “ground pivot specification” tech-
that you find this real-world design experience
                                                         nique for three precision positions, described in
to be exciting and rewarding!
                                                         Section 8.19 of the Erdman et al. text2 .
   This document summarizes the project expec-
                                                           You will have to reduce your problem state-
tations. The critical due dates are summarized
                                                         ment to three precision position format suitable
in Fig. 1. The major topics to be addressed by
all projects are then introduced. The require-                The three position program will implement Equations
ments for the project proposal, written reports,         (8.19) and (8.20) in the Erdman et al. text.
                                                              Other common enhancements include adding loops to
and oral presentations are then described in de-         automatically generate a family of potential solution link-
tail. Structuring and managing your team are             ages and adding logic to differentiate desirable solutions
discussed. Suggestions for producing a quality           from problematic solutions.

 Item                                                                Due Date
 List of team members                                                Discussion   Section   2 (9/16-9/19)
 Project proposal                                                    Discussion   Section   3 (9/23-9/26)
 Oral presentation, written report & model, kinematic prototype      Discussion   Section   9 (11/4-11/7)
 Oral presentation and written report, final design                   Discussion   Section   13 (12/2-12/5)

                                    Figure 1: Project Calendar.

for motion, path, or function generation. An             1.3   Concept      Demonstration             Proto-
example problem statement is included in Ap-                   type
pendix A. You will then generate a family of link-
ages to solve your problem using your computer           Computers provide helpful “soft modeling” ca-
program. You will select the “best” of these link-       pability; however, “there’s nothing like the
ages in Step 1.2.                                        real thing” when you’re designing mechanisms.
                                                         Therefore, you are required to build a prototype
  While not required, you may wish to explore            of your final choice for your mechanism before
using the “LINCAGES” program to assist syn-              proceeding with the detailed design of its ma-
thesizing the mechanism for your project.                chine elements. A well built cardboard model
                                                         will suffice to meet the minimum project require-
                                                         ments. However, you are encouraged to be as
                                                         fancy as you want. Here’s your chance to demon-
1.2   Linkage Analysis                                   strate your creativity!
                                                            The concept demonstration prototype is due
As you will learn in class, not all linkages de-         at the ninth discussion section. Your model
signed using synthesis theory provide useful solu-       should be used to demonstrate your mechanism
tions to your problem. Furthermore, some link-           during your team’s oral presentation. In addi-
ages may solve your problem better than others.          tion, you will turn in the model for grading at
Therefore, the synthesis step must be followed           that time.
by a thorough analysis of the most promising so-            The Student Shop in ME 180 will be avail-
lutions.                                                 able for building models. The Shop Managers
  A thorough hand analysis will suffice to meet            are Mr. Mel Chapin and Mr. Peter Zimmermann.
the minimum project requirements. Typically,             The shop opens at 7:30 AM and closes at 6:00
you may want to analyze the displacement, me-            PM on weekdays. The shop is not open on
chanical advantage, velocity, acceleration, and          evenings or weekends. (A staff supervisor must
force transmissibility of your solution mecha-           be present while the shop is open.)
nism.                                                       You must view a series of safety videos before
   You are encouraged to utilize linkage analysis        you are allowed to use the shop. See the “First
programs, such as “ADAMS” (R) or the “Me-                Day Class Information” handout for dates and
chanica” (R) module of Pro/ENGINEER (R), to              times. These are the only times that safety train-
assist in the analysis of your solution mechanism.       ing will be available for this class.
You may also write your own analysis software,
if you prefer. If you use computer assisted anal-        1.4   Detailed Design of the Machine
ysis tools, interpreting your output in your oral              Elements
and written reports is important: pages of unex-
plained computer output are not complementary            The concept demonstration prototype is in-
to your report. Rather, highlight relevant results       tended to validate the basic kinematics of your
and include a written explanation of their signif-       mechanism. While quality construction of your
icance.                                                  demonstration prototype is encouraged, care-

fully thinking through the details of every link                   2     Project Proposal
and joint of the production machine isn’t war-
ranted until the kinematics are validated. Fol-                    A one-page project proposal is to be handed in
lowing validation, you can proceed with the de-                    during your third discussion section. This should
tailed machine design.                                             include the names of the members of your design
   What will be the design life of your machine?                   team, a description of your mechanism task, a
If your machine were put into production, how                      statement of whether the task is motion, path,
many machines would you plan to build? If your                     or function generation, a sample set of three
machine is a piece of capital equipment, its cost                  precision positions for your problem (including
may be secondary to its durability; however, if                    a sketch), and any relevant constraints on your
it is a consumer product, you may be forced to                     problem.
choose the most economical parts that can meet                        A sample is included in Appendix A. Assign-
the design life.                                                   ing dimensional values to the precision positions
                                                                   and constraints is important to precisely defin-
   Once you have decided on a life and a produc-
                                                                   ing your problem. You may have to vary these
tion quantity, you can proceed with the machine
                                                                   initial values as you delve into your mechanism’s
element design and selection. How much load
                                                                   design; no penalty is assigned to refining your
will each link and joint be expected to carry?
                                                                   initial guesses. Nevertheless, making your best
Will loads be constant or fluctuating3 ? Once
                                                                   guess at the start is important in demonstrating
loads and life are defined, you can proceed to call
                                                                   your understanding of the problem.
out the actual machine elements used in your fi-
                                                                      Your project proposal must be approved by
nal design by applying the machine component
                                                                   the teaching assistants. Modifications are fre-
design methods presented in Part II of this class.
                                                                   quently required at this stage. The TA will be
These methods are also described in Part 2 of the
                                                                   seeking to ensure that the project that you have
Juvinall & Marshek text.
                                                                   proposed will be a good match to the synthesis
   We will be presenting design and selection                      methods taught in this class. In extreme cases,
methods for an arbitrary sampling of compo-                        you may be asked to choose a different prob-
nents in lecture. We may or may not cover                          lem altogether. This doesn’t mean that your
all components that you need for your machine.                     initial idea was poor; rather, it means that we
For example, if a spring is a critical compo-                      have concerns as to whether your problem can
nent of your machine, note that spring design                      be solved using a simple mechanism designed us-
is presented very late in the course syllabus4 .                   ing the precision position approach. Feel free to
Therefore, you may have to take the initiative to                  confer with the instructor or the teaching assis-
study the appropriate chapters in the Juvinall &                   tants if you have questions about what is likely
Marshek text to make intelligent selections of all                 to constitute a good project.
the machine components required for your de-
sign5 . Alternatively, vendor catalogs often con-
tain “engineering” sections which instruct you on                  3     Reports
how to choose components which will withstand
expected loads.                                           Two written reports are required. The first will
                                                          summarize the design of the mechanism portion
      Recall from ME 3221 that fluctuating loads require a of your machine. The second will summarize the
fatigue life analysis. Your machine will probably have at design of the machine elements utilized to imple-
least a few components subjected to fluctuating loads.     ment that mechanism in your final machine.
      If the lectures run late, a chance exists that springs
may not be discussed in lecture at all.
      Note that the ordering of the chapters in Part 2 of          3.1   Mechanism Report
Juvinall & Marshek is largely arbitrary, also; i.e., Chapter
12, on Springs, is in no way dependent on Chapters 10 or           The first report, due at the ninth discussion sec-
11.                                                                tion, should be formatted as follows:

1. Grading sheet. Attach the grading sheet in-              (See Appendix A for a sample.) The Prob-
   cluded as Appendix C of this document as                 lem statement included in the final report
   the cover page to your report.                           may contain modifications from the original
                                                            project proposal if the changes are justified
2. Abstract. The abstract should describe your              elsewhere in the report.
   project goal and summarize the results in
   approximately 200 words.                              7. Drawing and description of the final mech-
                                                            anism. Include a careful scaled drawing of
3. Table of Contents. List the title and page
                                                            your final solution indicating the critical di-
   numbers of the following sections. If you
                                                            mensions of the mechanism. This is required
   have multiple Appendices, assign a title to
                                                            in addition to the model. The use of CAD
   each of them and list them each individually.
                                                            software, such as “Pro/ENGINEER (R)”,
4. Contributions. All team members are re-                  for making the final drawing is encouraged,
   quired to identify each page that they con-              but a high quality hand drawing is accept-
   tribute to the report. This can either be                able. Add a page of text to “walk the reader
   done by including a page-by-page summary                 through” your design.
   of each team member’s work after the Ta-
                                                         8. Description of synthesis procedures. Sum-
   ble of Contents, or by simply initialing each
                                                            marize how linkage synthesis techniques
   page in the report itself. Each team mem-
                                                            were applied to design your final solution.
   ber’s contribution to the report will be taken
                                                            This may include a brief summary of three-
   as a factor in grading; different team mem-
                                                            point synthesis theory (including important
   bers may receive different grades. Team
                                                            equations) and an example of the input and
   members who do not identify their contri-
                                                            output to your synthesis program (with ex-
   butions will receive no credit. No more
                                                            planatory notes, if appropriate). However,
   than five pages of the report should include
                                                            the description of how these tools were ap-
   the initials of more than one team member.
                                                            plied to produce your design is of greatest
   Pages in the Appendices must be identified
                                                            importance. Be sure to explain any spe-
   as well as in the main report.
                                                            cial synthesis techniques that you applied
5. Introduction. The introduction is your op-               to your project.
   portunity to sell your project to a person
                                                         9. Analysis. Describe how linkage analysis
   who is unfamiliar with your work. Tell why
                                                            techniques were applied to optimize your so-
   your mechanism was designed: what need
                                                            lution. This should include the actual per-
   does it fulfill? Discuss the value of your
                                                            formance parameters of your final design.
   project to society (think big, but don’t make
                                                            Include information such as the coupler path
   claims that will damage your credibility).
                                                            traced by your linkage in its range of motion,
   Put your work into perspective with similar
                                                            minimum transmission angle in the range of
   existing devices. Why is your design better
                                                            motion, the mechanical advantage of your
   than the existing products?
                                                            mechanism at critical positions, and any rel-
   Remember that a new reader may look no                   evant velocity and acceleration data. This
   farther than your abstract and introduction.             will probably be the longest section of your
   Use these to convince readers that the re-               first report. If you include computer results,
   mainder of your work is worth reading!                   highlight significant output and explain its
   The Introduction should be about 1 page in               relevance.
                                                        10. Conclusion. Evaluate the success of your
6. Problem statement. Clearly state your final               mechanism.     This provides you with a
   set of precision positions and constraints.              chance to point out any advantages of your

      mechanism. Suggest any further improve-              machine. The use of CAD software, such as
      ments that you might include if you had              “Pro/ENGINEER (R)”, is encouraged. In-
      more development time.                               clude about a page of text to explain your
                                                           drawings to the reader.
11. Appendix. Include a listing of your fully doc-
    umented three-point synthesis program. If              The Overview comprises your most effective
    you write any additional computer code (for            way of communicating your design to the
    example, an analysis program), you may                 graders.
    include it as an additional Appendix. If             7. Body. The Body should summarize the
    you utilize packaged synthesis tools such as            highlights of the analyses included in the
    “LINCAGES”, you may include any rele-                   Appendices. Define the design life. Clarify
    vant printout in an Appendix. You may                   the intended production quantity. Explain
    also include relevant results generated by              what was analyzed and why. Clarify the end
    your analysis program or an analysis pack-              results of the important analyses. Justify
    age such as “ADAMS (R)” in an additional                why select components were not analyzed,
    Appendix.                                               if appropriate
                                                           Detailed calculations are not normally ap-
3.2    Machine Elements Report                             propriate for the Body; they belong in the
The second report, due at the thirteenth discus-           Appendices. A 3-4 page Body is probably
sion section, should be formatted as follows:              appropriate for this project.

                                                         8. Conclusion and Recommendations. See the
 1. Grading sheet. Attach the grading sheet in-
                                                            guidelines for the Mechanism Report.
    cluded as Appendix D of this document as
    the cover page to your report.                       9. Appendices. The Appendices will comprise
                                                            the major portion of your machine element
 2. Abstract. The abstract should summarize
                                                            report. The Appendices should be catego-
    the most relevant highlights of your machine
                                                            rized into at least two parts. The first part
    element design and analysis in 200 words or
                                                            should include all available detail drawings
    less. Be sure to summarize the results in
                                                            and sub-assembly drawings (if necessary) of
    addition to stating the problem.
                                                            your final design. The second part should
 3. Table of Contents. List the title and page              document the design calculations you per-
    numbers of the following sections. You will             formed.
    have multiple Appendices in the machine el-            The drawings comprising the first part
    ement report. Assign a title to each of them           should be of sufficient quality to submit
    and list them each individually.                       to a model shop; i.e., a skilled machinist
                                                           should be able to construct your idea from
 4. Contributions. See the guidelines for the
                                                           these drawings. They do not have to be up
    Mechanism Report.
                                                           to draftsperson quality standards, but they
 5. Introduction. See the guidelines for the               should be neat, to scale, and include all es-
    Mechanism Report.                                      sential dimensions. Include all important
                                                           tolerances, such as tolerances on holes for
 6. Overview of your final design. Include as-              mounting bearings. Detail drawings of com-
    sembly drawings showing your final prod-                mercially available parts utilized in your de-
    uct and/or scaled sketches of your final de-            sign are not expected; rather, just identify
    sign. Label important components or sub-               stock parts in a Bill of Materials or assem-
    assemblies. Include two or three key dimen-            bly drawing. If components were selected
    sions to indicate the overall scale of your            from catalogs other than those provided in

        Walter Library, including a photocopy of the selection of machine components. Review what
        page showing the component and the cata- was analyzed and why.
        log cover or URL would be useful.                Even though each team’s oral presentation is
                                                      limited to 10 minutes, the talk should still in-
        The calculations section may include stress
                                                      clude a well-formed introduction and conclusion.
        calculations, buckling analyses, fatigue life
                                                      Complying with the 10 minute limit is necessary
        estimates, component selection calculations,
                                                      to provide sufficient time for all teams to speak.
        determinations of fits, design alternatives,
                                                      If your team exceeds 10 minutes, we may simply
        and the like. They should be of a quality
                                                      have to cut you off and assign “no credit” for the
        expected from an industry designer. Calcu-
        lations in the Appendices may be in pen-
                                                         Viewgraphs or electronic equivalents are re-
        cil, but they should be labeled, clear, and
                                                      quired. You are welcome to use computer pro-
        neat. The calculations should be organized
                                                      jection apparatus. We will reserve computer pro-
        and listed in sub-headings of the “Appen-
                                                      jectors for use during your discussion sections;
        dices” section of the Table of Contents for
                                                      however, it is your responsibility to ensure that
        quick reference by the grader.
                                                      your presentation is compatible with the avail-
        Format your calculations in appendix-ready able equipment prior to your presentation. Un-
        form from the start. Then, assembling the fortunately, we have no funds available to you
        Appendices will simply consist of organizing for preparing viewgraphs.
        your completed analyses, rather than having
        to unproductively re-copy draft work.
                                                                  5     Teams
        Note that analyses from the life prediction
        section of ME 3221 may be equally relevant                The names of three people7 comprising your
        to analyses from the machine component se-                team must be turned in to the teaching assis-
        lection section of ME 3222. For example, fa-              tant during the second discussion section. Nor-
        tigue life and buckling calculations are likely           mally, all members of a team will receive the
        to be relevant to your project.                           same project grade. However, if the reports or
                                                                  oral presentations indicate that any team mem-
                                                                  ber did not contribute their fair share to the
4       Oral Presentations                                        project, we may assign different grades to dif-
                                                                  ferent team members.
Oral presentations will be made during the same
                                                                     Please contribute to your project team. “One
discussion sections where the written reports are
                                                                  man shows” do not result in good projects; too
due. Each team’s oral presentation should last
                                                                  much work is involved. Participating as a strong
no less than seven and no more than ten minutes.
                                                                  team will make the project enjoyable for all
All team members must participate in the oral
                                                                     I highly recommend that all team members
  The first oral presentation should include a de-                 contribute to all steps of the project. Do not
scription of your project, a statement of your fi-                 allow one person to write the reports or build
nal precision position set and constraints, a sum-                the model. You will not be ready for these steps
mary of the results of your synthesis6 and anal-                  until late in the semester. These steps will be too
ysis, and a demonstration of your model.                          much work for one person by that time. Organize
  The second oral presentation should highlight                   your team carefully from the start.
the features of your final design. Justify your
                                                                        One or two teams per discussion section may be al-
    Note that you are not expected to review three point          lowed to have two or four members to enable matching
synthesis theory as part of your oral presentation; rather,       teams to the enrollment in each discussion section. Please
you are to clarify what methods you used to synthesize            consult with the teaching assistant before forming a team
your mechanism.                                                   of two or four.

6   Helpful Hints                                                            coupler link

1. Start by specifying the problem, not the so-
   lution. When you begin your project, you
   know only a task that you want to accom-
   plish. You will define this task using three
   precision positions. You will not know what
   the optimal solution mechanism will look
   like until week 8 or so.                                                              ground link
    Designers unfamiliar with the precision po-
    sition approach tend to start with a solution                Figure 2: A parallelogram linkage.
    and search for a problem. That is, they tend
    to try to adapt a pre-existing mechanism to               of moving the coupler link parallel to the
    solving a new task. While this “reverse en-               ground link. This is desirable if you do not
    gineering” approach may occasionally work,                want to tip the load you are moving; for
    it can lead to overlooking desirable solution             example, a person.
    mechanisms. The closed-form precision po-
    sition formulation is therefore required for              Unfortunately, the coupler link of a paral-
    this project.                                             lelogram linkage can only move in a simple
                                                              arc. Design projects based on this linkage
2. Do not design a mechanism more compli-                     tend to fall in the “solution looking for a
   cated than a four-bar linkage. The rule of                 problem” category8 .
   thumb of mechanism design is: “The sim-
   pler it is, the better it is.”                         4. Examples of a few past prize winning
    If a four-bar linkage and a ten-bar linkage
    are designed to accomplish the same task,
                                                               (a) Casement window hinge mechanism.
    the four-bar linkage is usually a far bet-
    ter solution. While the ten-bar may look                   (b) High chair table support linkage.
    fancier, it will almost certainly cost more,               (c) Front loader mechanism for a dump
    wear faster, and suffer from more joint slop                    truck.
    than an equivalent four-bar mechanism. If
                                                               (d) Bicycle derailleur mechanism (see page
    you feel that you have to use a mechanism
                                                                   45 of the Erdman et al. text).
    more complicated than a four-bar linkage,
    please obtain my permission first. (Some-                   (e) A golf tee resetting mechanism for a
    times, the added versatility provided by a                     driving range.
    six-bar linkage is justifiable.)                            (f) A folding desk mechanism.
    Many complex mechanisms exist only be-                     (g) “The Thing”: a mechanism that shuts
    cause simpler mechanisms could not be                          itself off(!) (see pages 50-52 of the Erd-
    found. The synthesis techniques that you                       man et al. text).
    will learn in this class greatly improve the
    chances of your finding a simple solution to               You are permitted to re-do any of these
    an arbitrary problem. Therefore, they may                 projects if you develop a new and unique
    prove valuable to you in industry!                        solution.
3. Do not design a parallelogram linkage. A                   More advanced synthesis strategies can be applied to
                                                         design six-bar linkages for parallel motion more complex
   parallelogram linkage is illustrated in Fig. 2.       than a simple arc. If you feel that your mechanism re-
   The linkage has practical value because it            quires such motion, you may consult with me to obtain
   is the only four-bar linkage that is capable          references on how to design such linkages.

5. Examples of some “dangerous” (grade-wise)

   (a) A mechanism to pour a bottle. (Why
       do you need a mechanism to pour a
   (b) A parallelogram linkage to load a
       wheelchair on a bus. (Synthesizing
       parallelogram linkages isn’t challeng-
    (c) An eight-bar mechanism to do any-
        thing. (You can usually find a simpler
        mechanism which will accomplish the
        same task better using the methods of
        this class.)
   (d) Any mechanism which requires belts,
       cams, cables, non-circular gears, etc. in
       the prototype. (A simple four-bar
       mechanism will generally provide a
       much superior solution.)

6. Use stock components wherever possible.
   The cost of fabricating a custom compo-
   nent typically greatly exceeds the cost of
   using a catalog component. In particular,
   you would rarely custom fabricate a gear or
  A variety of vendor catalogs will be put on
  reserve in Walter Library. Feel free to con-
  tact additional vendors directly. Many ven-
  dors now also describe their product lines
  on the web.

7. Enjoy your project! Machine design is a cre-
   ative and rewarding vocation.

A     Sample Project Proposal
Video Monitor Storage Mechanism
A mechanism will be designed to carry a computer monitor from a viewing position to a storage
position in a standard desk. Since the position and angle of the monitor are being controlled, the
problem is one of motion generation. A sample set of precision positions is provided below.

                    viewing position

                                             (0, 0)


                                       storage position


              PP2                                                     685 mm

                                                 505 mm

 PP1:   x1 = −305 mm         y1 = 0.00 mm     θ1 = 0◦     (viewing position)
 PP2:   x2 = −270 mm        y2 = −343 mm      θ2 = 8◦     (intermediate position; clears corner of desk)
 PP3:   x3 = 25.4 mm        y3 = −370 mm      θ3 = 0◦     (storage position)

No links of the mechanism can go above the top surface of the desk or below the floor. Furthermore,
for safety and appearance, no portion of the driver or follower links of the mechanism will be allowed
to move out the back of the desk or in the leg region. Therefore, all pivots of the mechanism should
stay contained within the 505 X 685 mm dashed envelope shown above throughout the entire range
of motion of the linkage.

B   Suggestions for Preparing Viewgraphs
• Simplify.

    – How many words can you remove from your overhead and still make your point?
    – Communicate a single, clear idea on each overhead.
    – Use keywords instead of sentences.

• Make the viewgraph clearly readable from the last seat in the room.

    – Include no more than six double-spaced lines of text.
    – Limit the length of each line to 45 characters or less.
    – Use a large, boldface font.
    – Use a font larger than 20 points.
    – Make figures and drawing large, simple and clear. Use bold lines.
    – Label axes of graphs with large characters.

• Put a title on each and every viewgraph.

• Make your viewgraphs from clean originals. A blurry image will never make a good viewgraph.

• Standardize.

    – Stick with a single font style.
    – Try to standardize the size of your artwork.

• Use contrasting colors.

    – Black won’t be readable on blue, green or red backgrounds.
    – Yellow won’t be readable on a clear background.

Appendix C                                     Project Grading Sheet: Mechanisms Portion
ME 3222 - Design & Manufacturing II                  Due at the 9th Discussion Section (11/4/02-11/7/02)

Project Title:

Team Member 1:                                                                     Grade:

Team Member 2:                                                                     Grade:

Team Member 3:                                                                     Grade:

Team Member 4:                                                                     Grade:

                                  Category                                        Points           Points
                                                                                 Possible          Earned

 1) Mechanism Synthesis                                                             15
    Was the 3 prec pt analytical method used to generate solutions?
    Were enhancements made to the basic 3 prec pt analytical method?
    Were multiple candidate solutions generated?
    Were any specialized synthesis methods applied or developed?

 2) Mechanism Analysis                                                              15
    Does the mechanism move well between precision positions?
    Is force transmission good throughout the range of motion?
    Were all relevant analyses applied?
    Are the results of the analyses presented clearly?
    Is there evidence that the final mechanism is the “best” solution?

 3) Concept Demonstration Prototype                                                 10
    Does the model validate the results of the synthesis process?
    Does the model make the task clear?
    Are the precision positions indicated?
    Is the construction of good quality?

 4) Written Report                                                                  10
    Are all sections described in Section 3.1 included?
    Is every section complete and well organized?
    Is the quality of the writing good?
    Are there enough figures? Are they of good quality?

 5) Oral Report                                                                     10
    Did the talk include a well-formed Introduction and Conclusion?
    Were all important project highlights addressed?
    Were there enough viewgraphs? Were they of good quality?
    Were all speakers easy to hear and understand?

 TOTAL                                                                              60

            Note: Please use this sheet, or a copy of it, as the cover of your mechanism report.

Appendix D                            Project Grading Sheet: Machine Elements Portion
ME 3222 - Design & Manufacturing II                 Due at the 13th Discussion Section (12/2/02-12/5/02)

Project Title:

Team Member 1:                                                                     Grade:

Team Member 2:                                                                     Grade:

Team Member 3:                                                                     Grade:

Team Member 4:                                                                     Grade:

                                  Category                                        Points           Points
                                                                                 Possible          Earned

 1) Machine Element Synthesis                                                       10
    Is the design well suited to the task and intended production quantity?
    Does the design appear to be original and optimal?
    Are the final assembly drawings clear and complete?
    Are sufficient detail drawings included? Are they of good quality?

 2) Machine Element Analysis                                                        10
    Were all relevant analyses performed?
    Are the analyses technically correct?
    Are the results of the analyses presented clearly?
    Were any analyses beyond those described in lecture applied?

 3) Written Report                                                                  10
    Are all sections described in Section 3.2 included?
    Is every section complete and well organized?
    Is the quality of the writing good?
    Are there enough figures? Are they of good quality?

 4) Oral Report                                                                     10
    Did the talk include a well-formed Introduction and Conclusion?
    Were all important project highlights addressed?
    Were there enough viewgraphs? Were they of good quality?
    Were all speakers easy to hear and understand?

 TOTAL                                                                              40

            Note: Please use this sheet, or a copy of it, as the cover of your mechanism report.


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